WO2005125032A1

WO2005125032A1 - Interrogator for wireless tag communication system

Info

Publication number: WO2005125032A1
Application number: PCT/JP2005/010776
Authority: WO
Inventors: Kazunari Taki; Tsuyoshi Ohashi; Takuya Nagai; Kentaro Ushiyama
Original assignee: Brother Kogyo Kabushiki Kaisha
Priority date: 2004-06-15
Filing date: 2005-06-13
Publication date: 2005-12-29
Also published as: CN1969464A; US20070080787A1; EP1758256A1; JPWO2005125032A1; JP4239033B2; CN1969464B; US7602293B2

Abstract

[PROBLEMS] To efficiently send/receive wireless tag information in a short time, even when wireless tag circuit elements are dispersed over a large area. [MEANS FOR SOLVING PROBLEMS] An interrogator (100) is provided with antennas (1A, 1B, 1C, 1D, 1E) for performing non-contact information communication with an IC circuit part (150) of a wireless tag circuit element (To) to be interrogated, a control circuit (4), and a high-frequency circuit (2) provided with a directivity switch control part (211). The control circuit (4) and the directivity switch control part (211) control directivity of the antennas (1A-1E) to be wide when a communication distance is short, and to be narrow when the communication distance is long, depending at least on the information communication distance.

Description

Book

Wireless tag system

Art field

0001, related to the tag system for clearing or writing only to wireless tags that can communicate information with the outside via wire. For a tag of type 002, the reader / writer responds to the inquiry and response by touching the tag as a question, so that the system can capture only the information from the wireless tag (ado eec de f cao). Is known. 0003 A wireless tag provided on a tag without a tag, a C for storing predetermined tag information, and an antenna connected to the C for receiving the information are provided. Even when it is not visible, the D-writer can access C (take in information only), and it can be used in the fields of merchandising and inspection, as well as the movement of objects and people. Practical use is expected.

Since the access to the tag information of C of the wireless tag has been performed as described above, a signal having a certain output value is transmitted to the device antenna by using the fact that the nearer the wireless tag, the more accessible the output is. Then, the groups that respond to this are recognized, those are put to sleep, a signal with a rather large output value is transmitted, and the group that responds to this is recognized as, and this is repeated to count the number of tag positions. There are things that are recognized separately in the area of (for example, Patent 00051 344562 (9-32, 34)

Issues that Ming is trying to solve

In the 006 operation, the transmission value is gradually increased, the groups responding within the region corresponding to the value are sequentially identified, and this is repeated to repeat the tag. Recognize the location by dividing it into several areas. At this time, the directionality of the device antenna was not particularly changed, and the signal was relatively transmitted to the wireless tag.

In both cases, the signal is transmitted to the wireless tag relatively, and the deviation is wide with directivity.

As described in 007, the groups located within the area are recognized as a unit, so to access them individually, the tag information section must be specified sequentially and a separate search must be performed. The larger the number, the more rapidly the interval will increase. As a result, when wireless tags are dispersed over a wide area, it takes a lot of time to access each tag, and efficient wireless tag information

I couldn't do it.

It is an object of the present invention to provide a wireless tag system capable of efficiently and efficiently transmitting wireless tag information even when wireless tags are dispersed in a wide area.

To solve the problem

In order to achieve the target, the information communication is performed without contacting the tag c of the query object, and the directivity of the number of antennas at least in accordance with the separation of the communication. And directivity control means for controlling the

001 10 Directivity control means controls the antenna directivity according to the information communication distance, so that the directivity can be used for short and long communication distances, and optimal antenna characteristics can be realized. . As a result, even when the wireless tag is dispersed over a wide area, the wireless tag information can be efficiently transmitted in a short time, compared to a structure in which the antenna directivity is the same whether the communication distance is short or long. 00112, in the above description, the directivity control means increases the directivity by the number of antenna elements when the separation is short, and sets the directivity by the number of antenna elements when the separation is long. It is characterized by having If the separation is short, communication is performed even if the directivity is widened, so the number of wireless tags existing in the communication area is limited, and information and communication separation are efficiently long. In such a case, the wireless tag information can be obtained efficiently and in time by making the information more realistic by limiting the communication range with directivity. [0113] In the above-mentioned or the second shift, the directivity control unit maintains the directivity of the number of antenna elements so as to be stronger in only one direction, and sequentially changes the direction. It is characterized by having direction means.

The direction is sequentially changed by increasing the directivity combined by the plurality of antenna elements in one direction by the means, and a predetermined calculation process is performed according to the degree and phase of the antenna element in each direction. With the use of the eye antenna or the beaming control method, it is possible to easily estimate the direction and position of the wireless tag.

00154, In the above-mentioned item 3, the means may be such that when the separation is short, the switching direction of the directivity is large, and when the separation is long, the directivity is small. It is characterized in that the reversal interval is increased.

When the separation is short, the communication range is limited even if the directivity is widened and the directivity () is changed at a large interval. Therefore, the number of wireless tags existing in the communication range is also limited, and efficient information and communication separation are performed. If the information is long, the directivity is changed by changing the directivity () at intervals, and by limiting the communication area in order, the information becomes more reliable and more efficient. Information on wireless tags can be sent.

000175, in the above or the second paragraph, the directional control unit is characterized in that the directivity by the number of antenna elements is optimized so that the reception sensitivity to the tag elements is optimal. .

The directivity synthesized by the plurality of antenna elements by the

In order to optimize the receiving sensitivity for the tag, a method based on adaptive control that performs predetermined arithmetic processing according to the antenna power and frequency is used to detect the radio tag at high sensitivity and at the same time to detect the direction and its location. Estimate the position It is possible to

[0096] In the deviation of the above-mentioned five items, the directivity control means may include an antenna stage for increasing or decreasing the number of antenna elements used by the number of antenna elements according to at least the distance of the broadcast communication. It is characterized by having.

00200 The antenna stage increases or decreases the number of antenna elements used in accordance with the broadcast distance, thereby using the directivity by changing the number of antenna elements used when the communication distance is short and long. Optimal antenna directivity can be realized. [0121] In the above item 6, the number of antenna elements used by the number of antenna elements is increased when the distance between the antenna and the broadcast communication is long.

When the number of antenna elements to be used is large, directivity can be further improved, so that stable communication can be achieved.

01238, in the above or second statement, the direction control means has a number of wireless tags for detecting the number of the tags present in the communication area, and is detected by the number of tags. The directivity is controlled by the number of antennas according to the number of wireless tags.

The direction control means controls the antenna direction not only according to the number of wireless tags but also according to the number of wireless tags present in the surrounding area, so that the number of wireless tags is small. In many cases, the directivity can be used properly, and the optimal antenna directivity can be realized. As a result, wireless tag information can be obtained more efficiently and in time.

[0099] In the shift of the above-mentioned eight paragraphs, the method is characterized in that it has power control means for increasing or decreasing the communication power at least in accordance with the separation of the broadcast communication.

Since the control means increases or decreases the communication power in accordance with the information communication distance, the communication power can be reduced depending on whether the communication distance is short or long, in other words, the transmission distance of the radio wave can be used properly. Achieve optimal communication environment with antenna directivity It becomes possible.

927, the area is divided into several areas and set according to the number of the tags existing or expected to exist in the communication area determined by the communication power and the directivity. It is characterized in that the tag and the signal corresponding to the tag are displayed for each of the dividing stages.

The communication area is divided into small areas according to the small number of radio tags in the communication area determined by the communication power and the directivity. As a result, when the number of RFID tags is large compared to the area, the information is not exchanged with the tags in the area at once, and the area can be divided into small areas and the information can be exchanged with the wireless tags every time. Become. By doing so, it is possible to receive raw RFID tag information.

The access for generating an access report for accessing the tag report of 1c of the tag in the above 9 or the statement of 9 above,

And transmitting the access information generated by the access stage to the tag device by touch through the number of antenna devices, and

An access report first generated by the access stage in response to at least the direction control of the direction control by the direction control means and the control of the transmission power by the direction control means. And an access means for controlling the kind of the service.

[0093] The access means controls the type of access generated first according to the directivity control of the directivity control means, so that the type of access information is used differently when the directivity is narrow and when the directivity is wide. It is possible to realize a kind of access information. As a result, wireless tag information can be obtained more efficiently and in time. [0131] In the above description, the access means may be a conditional instruction for the access stage to unconditionally acquire the tag information of c above in response to the control of the directivity by the directivity control means. , With the condition for acquiring the tag information of c under a predetermined condition It is characterized by controlling the generation of the delay of the instruction to search and obtain the tag information of the instruction and C under uncertain conditions.

By using these unconditional commands, conditional commands, and commands in accordance with the antenna directivity controlled by the directivity control means, the most suitable information is realized when the directivity is narrow and when the directivity is wide. It becomes possible. 9333, in the above-mentioned item 2, the directivity control means, the control means, and the access means spread the transmission power to generate the conditional command by transmitting the directivity to the tag, and transmit the conditional command to the tag. It is characterized by performing control in cooperation with each other.

[0094] In a large area determined by directivity and high communication power,

Many tags and information using conditional instructions

It becomes possible.

In the above item 2, the directional control means, the control means, and the access means first generate the conditional instruction after the directional spread of the transmission power, and It is characterized in that control is performed in cooperation with each other so as to be transmitted to the user.

[0086] Directivity Directionality is high only in a small area that is determined by small communication power, and information can be efficiently transmitted by wireless tags and unconditional instructions.

In the above description, when it is expected that a large number of the tags are present, the directional control means, the control means, and the access

The means performs the control in cooperation with each other such that the command is generated with the transmission power reduced and transmitted to the tag.

[0098] Directivity [0139] In a limited area that is determined by small communication power, efficient information can be obtained by dense radio tags and commands and conditional commands. [0096] In the above item 2, the directivity control means, the control means, and the access means first generate the conditional instruction after making the transmission power large, and the tag element It is characterized in that control is performed in cooperation with each other so as to be transmitted to the user.

004 It is possible to efficiently transmit information with a wireless tag that has a high probability of being present only in a narrow range determined by communication power with directivity and an unconditional instruction.

004, the directional control means, the means for controlling, and the access means according to the above-mentioned item 3, wherein the command is generated by widening the transmission power to generate the command and transmitting the command to the tag. When it is expected that a large number of the tags are present, the command is generated by directing the transmission power, the command is transmitted to the tags, and the transmission power is further directed. Control is performed in cooperation with each other such that the conditional instruction is generated first and transmitted to the tag.

0042 First, increase communication power, widen directivity, generate command, and

When the number of wireless tags transmitted to the mobile phone and responded is large, the communication power is reduced, the directivity is reduced, the mobile communication area is divided, and a search command is first generated to generate information. Then, when the reception of information is completed by the tag of the question, the transmission power is made highly directional, an unconditional instruction is generated first, and the information of the information is efficiently transmitted to the remaining wider range of the tag.

By doing so, it is possible to obtain information about the wireless tags from the surrounding tags and efficiency.

00438, in the above-mentioned 3, the directivity control means, the control means, and the access means generate the command by spreading the transmission power to the directivity, and transmit the command to the tag. When it is expected that the number of the tag tags is small, the signal power is spread to generate the condition command, transmitted to the tag tag, and further transmitted. In addition, control is performed in cooperation with each other such that the conditional power is generated by directing the transmission power and the conditional instruction is transmitted to the tag.

0044 First, increase communication power, spread directivity, generate command, and

When the number of wireless tags transmitted and responded to the mobile phone is small, the communication power is increased, the directivity is increased, an unconditional instruction is generated, and information is efficiently transmitted over a wide communication area. Then, when the reception of information is completed by the tag of the question, the transmission power is made highly directional to generate an unconditional command, and the information of the information is efficiently transmitted to the remaining tags of the wider range.

By doing so, it is possible to report wireless tags more efficiently with surrounding tags.

Invention

According to the above description, the directivity is used in the case where the communication distance is short and the case where the communication distance is long, and the optimum antenna directivity is realized. Information on wireless tags can be sent.

[0086] This is a system that represents the abbreviation of the wireless tag system that is the object of use of the state of the description.

FIG. 3 is a block diagram illustrating an example of the functional configuration of a wireless tag device provided in the wireless tag illustrated in FIG.

FIG. 4 is a functional diagram showing an active configuration of a high-frequency path provided for the question shown in FIG.

This is a symbolic representation of the antenna's directional behavior according to Fig. 4.

The control path shown in Fig. 5 is a chart that represents the row control procedure in order to perform directivity control with 5 antennas.

6 This is a method that intentionally expresses the directional movement of the antenna due to the second aspect of the description.

7 The antenna's directional movement due to It is represented by.

9 is a chart representing the operation procedure in order to execute the directivity control in the antenna.

FIG. 10 is a diagram showing an action in a row where only the adaptive adaptation is performed.

11 is a chart showing a control procedure related to the adaptive control performed by the control path in FIG.

FIG. 14 is a diagram illustrating the operation of a modification in which a received signal is adaptively processed instead of being subdivided into 12 areas and transmitting a command.

It is a diagram showing an example in which 132 tags are in the same direction and cannot be distinguished by the directivity in the adaptive processing.

Of the issue

0074-Antenna (antenna)

2 frequencies

3 f (access)

4 (antenna stage, directivity control means control means

Access means) 5 c

2

2 Directivity (means, directivity control means)

2 2 Shinbu ()

o tag

Good for implementing

Hereinafter, the embodiment of the present invention will be described with reference to the drawings.

004 represents an abbreviation of the wireless tag system to which the present embodiment is applied. Stem.

In this embodiment, the tag system S is composed of a number of tags corresponding to the tag system S according to the present embodiment.

A tag O and a wireless tag o having an antenna 5 and a C 5 are provided.

In this example, the antenna 5 of the wireless tag o receives a signal by wireless communication with the antenna 5 of the wireless tag o. It has a frequency 2 for the matrix, a 3 for processing the signal read from the wireless tag o, and a control 4.

The antennas are arranged at a predetermined distance from each other, and the directivity as an antenna body is controlled by electrons by the directivity control described later.

Reference numeral 504 denotes a so-called icon, which is described in detail, is composed of a central processing unit, such as CPRO, and uses the time storage function of the CPU to process the data according to the program stored in O. It is a line.

FIG. 552 is a block diagram showing an example of the functional configuration of the wireless tag o provided in the tag.

In 00562, the wireless tag o is located above the antenna on the above side.

Antenna), and C5 connected to the antenna 5.

C5 rectifies the power received by the antenna 5 52, accumulates the green onion flowing through the 52 and uses it as a kinetic power source of C5 53, and the wave received by the antenna 5 A cook 54 that extracts the cook signal and supplies it to the control 57, and 55 that functions as information that can store a predetermined signal, is connected to the antenna 5 described above.

56 and 52 above, cooks 54, 56, etc. 57 for controlling the movement of the tag o. [0085] The tune 56 modulates the signals received from the antenna 5 based on the signals received from the antenna 5 based on the signals received from the antenna 5 and the like.

55757 interprets the received signal adjusted by 56 above, and

A reply signal is generated based on the information signal stored in 55, and the basic control of the control returned in 56 is executed.

006 03 is a function representing the active composition of the high frequency 2 provided above.

It is a figure.

0063, the radio frequency 2 includes: a directivity 2 connected to the above-mentioned antenna having a transmitting / receiving function, a transmitting unit 2 2 for transmitting a signal from the antenna to the wireless tag o via the directivity 2; It is composed of a receiving section 23 for receiving the information of the wireless tags o received by the antennas.

The directivity 2 is obtained by adding the powers of the antennas 2 to 2 related to the antenna (to be referred to as the following), the receivers 2 2 to 2 2 related to the antenna 1 and the receivers 2 2 to 2 respectively. 3 is connected in one direction to the transmitting antennas 2 to 2 or the receiving antennas 22 to 22 2, that is, the signals from the transmitting antennas 2 to 2 are transmitted to the antenna 1 24 to 24 for transmitting the signals to the receivers 22 to 22 (for example, consisting of Sakida and the like, hereinafter). [0063] Units 2 to 2 are input to the signals from the control 4 and the phase shifts 25 to 25, which variably set the phase of the radio signal at the antenna to the corresponding signals, and the signals to the control 4 Included are amplitude signals included, and amplifying signals input from phase shifts 25 to 25 in accordance with the input signals, and gain amplifiers 26 to 26 corresponding to the above 24 to 24, respectively. [0064] The units 22 to 22 input the signals from the control 4 and variably set the phase of the received radio signal at the antenna to according to the input. The phase shifts 27 to 27 and the signals from the control 4 And the reception gain amplifiers 28 to 28 for amplifying the signals input from the phase shifters 27 to 27 in accordance with the input and amplifying the amplified signals. It should be noted that transmission gain amplifiers 26 to 26 may be replaced by variable amplifiers instead of gain amplifiers 28 to 28.

The communication unit 22 accesses the tag information of C5 of the wireless tag o (an oscillation circuit for generating a matrix for fetching or a P-controlled oscillation circuit 25; In the example of modulating the generated signal based on the supplied signal, based on the XS signal from control 4 and the like, the amplitude is adjusted to 26 (amplifying amplifier for amplitude adjustment, etc. may be used). You. This is desirably 9 z or 2.45 Gz, and the harmonic modulated by the above 26 is supplied to the above 2 to 2 and further transmitted and received by the 2 to 2 4 antennas. Supplied to C5. The transmission unit 23 receives the signals received by the antennas

2, the reception 2 8 is multiplied by the wireless tags o and 2 generated in 2 3

A receiver 29, a receiving antenna 22 for amplifying the power of the ground switch 29 and supplying the amplified power to the second heater 22, and an antenna

Are generated by the above-mentioned communication unit 22 with the wireless tags o, etc., which have been passed through the units 22 to 22 and which were combined at 23.

2 222 which is multiplied by the fact that the phase has been postponed, and 2nd switch 223 for extracting only the signals in the necessary area from the 2222 power, and the power of 2nd switch 223 And a receiver 2 225 for amplifying the signal and supplying the amplified signal to 2 224. Then, the signal output from the The signal RSQ output from the XS 2 224 is input to the above 3 and processed.

[0067] Further, the received signals 222 and 225 are also input to the (Receved gna enghndcao) 226, and the SS indicating the frequency of those signals is input to the signal 3. In this way, in the present embodiment, the tuning of the wireless tags o is performed according to the key.

00683 performs the constant arithmetic processing input from the high-frequency signal unit 23 described above, and modulates the modulation signal in accordance with this.

2 6 Further, the control 4 performs the above operations 2 to 2 22 to 22 according to the result of the arithmetic operation of the above 3. For example, this 4 is connected to a communication line via, for example, an input / output interface (not shown), and the Shintosa, other terminals,

It may be configured so that information can be exchanged with the server.

[0069] In practice, the directivity of a plurality of antennas is controlled so that the directivity is strengthened in only one direction, and the directions are controlled sequentially. Signals are transmitted by using the fact that when the antenna is tilted at a high angle with respect to the antennas, the difference in the phase of the radio wave appears only at those antennas. By controlling the phase, it is possible to direct the direction of the radio tag toward the direction of the wireless tag. (Also, by controlling the phase as described above, the phase is generated only in the signal on the path. A matrix of signals with directivity according to the location of the wireless tag.Especially, in the present embodiment, when a large number of tags are widely distributed, according to (communication) from a question to a tag, Antenna ~ Directivity by Gosuru By, vinegar for the tag o at more than hour radio tag report of 〒 maximum of that of the tag of It is.

007 4 represents the above-mentioned directional operation of the antenna ～.

In 00714, the direction of high frequency 2

2 is capable of changing the directivity of the antenna and the sharpness and the direction of the transmission and changing both of them. Particularly in this example, when the communication distance is short, the directivity of the antenna is widened (the beam width is increased). If the communication distance is long, the directivity by the antenna is reduced (the beam width is narrowed).

[0072] That is, first, the directivity of the antenna is assumed to be the character (most widely), and a search for a relatively long distance from the antenna is performed (4a)). [0073] Next, the directivity of the distance is slightly increased.索索.

In this case, in response to the narrowing of the search area where the directivity was slightly reduced, the direction was changed to several times in the example of 2), and the search was switched by switching 2 to 2 (4 (b ))

[0074] Then, he searches for a further long distance C with more directivity. In this case, in response to the narrower directivity and the narrower search area, the direction of the directivity is changed to a larger number7), and the CC2C3C4 of 7 is changed. Switch to C5C6C7 and search for cable (4c))

0075 5 is the directivity (アンテナ)

) Is a chart showing a row control procedure for executing the control 4). In 765, for example, when there is an appropriate force to start from a new operating unit, this is started.

First, in step S, the size of the antenna is set to its head ax5 and the increase interval is set to 2, and further, in the example of the direction of the antenna of the book, the direction of the antenna is increased only in one direction. Certain criteria (for example, one direction from the viewpoint of a question) when holding and changing the direction (IaI).

9, facing the front.

, The other.

The direction is 9 and the other direction is the large direction. ) Directivity (, 0N as the beginning of directional geometry, directional 0 in order.

Set the large value (large 6 nd g) as the closing price for the next time. Note that the value of the above 0N and the value of the large interval N (after) are expressed in the form of 5 below, for example, within 4 Fixed (or rewriteable).

Next, the process proceeds to the step, and the step of “0” is performed.

(Initial 0N) Attenuator-Initially, only Athena C is used, only Antenna C of 3 described later is used. ), And outputs the corresponding phase signal to transmitters 2 and 2 (or receiver 22 22 22 C), and then outputs the co-AD signal, which is an unconditional tag command for the wireless tag. Output and receive the answer (if any). Note that the information for the transmissions 2 to 2 and the receptions 22 to 22C is stored in advance 4 corresponding to the directivity 0 directivity.

More specifically, the control 4 outputs the signal 3 and generates the XS signal, and outputs the signal to the transmission 26. The transmission 26 performs the above-described adjustment and becomes the coA signal as the access information. 4 generates an XPW signal and outputs it to the above-mentioned units 2 to 2, and the transmission amplifiers 26 to 26 perform signal width based on the XPW signal based on the XPW signal (gain). If there is an antenna, it is appropriate to use it. In addition, for transmissions that are not amplified, the phase is determined by the signal, and finally transmitted via the antenna ~, and the radio tag of the elephant is It encourages the communication of tags o, etc. Note that since this time is common to all hands, the following will be explained. Consist, send

Control the rate and phase of the road.

0080 And above. Any wireless tags that responded to OAD

o Reply sent from (wireless, including ) Is received from the antenna and is controlled by the receivers 22 to 22, and then is received by the receiver 3 via the receiver 23.

[0081] Then, in step 3, it is determined whether there has been a wireless tag responding in the above-described manner (for example, the tag has been notified). If the responded wireless tag is, and the information is successfully obtained, the condition of step 35 is satisfied, and the process proceeds to step 37, in which a step command is transmitted and the step is performed. As a result, the information of the wireless tag can be obtained without performing a complicated step of specifying the wireless tag by repeatedly transmitting the command and the conditional command described below, and the information can be obtained efficiently. On the other hand, if the number of responding wireless tags is 2 or more, the information acquisition fails due to a collision (when a valid signal for the vibration is received but the acquisition fails), the condition of step 35 is not satisfied, Go to step 4.

[0082] In step S4, the command for the wireless tag in the above-mentioned 0 cases is issued.

By outputting the Png (Png D) signal and the co D signal, which is a conditional command, and receiving the response, it recognizes all the tags that responded by the process in step S2 (with the matrix of tag information). This is a sp () instruction for the tag that has been completed (tag information has been received) and outputs the p-number.

In detail, the part of D () is specified in the Png number, and the response from the corresponding wireless tag is temporally separated and extracted. In this way, they are separated in time

Using the detected wireless tag, further obtains all the items of D using the coD number, and when the acquisition is completed, sleeps in that spun (do not answer). By repeating the above procedure with the designation D repeated, the tag is completely and individually detected for each tag for which a response was detected in the step and step.

0084 Step 37 When step 4 is completed, return to step 2 to output the co-AD signal, which is an unconditional tag command for the wireless tag, as described above. Wireless No response will be given if dormancy has ended and the child has been dormant. As a result, the condition in step S3 is not satisfied, and the process proceeds to step S5.

0085 In step S5.

Add the above (in this respect, 01) to the above.

.

[0086] Then, the process proceeds to step S6, in which is determined, for example, a value larger than the above nd (9). At this point, 0N (0.) was added to the initial 0 (01.).

As a result, the value becomes 0 and becomes larger than nd, so that the condition of step S6 is satisfied, and the process proceeds to step S7.

In step S7, it is determined, for example, that the antenna ax is set to 5). As described above, if, this condition is not satisfied, and the routine goes to Step S8. In step S8, two are added to the above-mentioned antenna in the above-described example (therefore, the number is increased from three to three at first). This gives 0.0N 4.

5 Ng. (5 lower te). Then, returning to step S2, the same order is repeated.

0088 That is, the orientation 0.

As described above, in step 2 to step 4, as described above, the co A D is transmitted, and after responding to the request, N (9.) is added to step S5. 45. To increase. Since the value of 0 is smaller than nd, the condition of step S6 is not satisfied, and the process returns to step S2, and the direction is 045. Repeat the same search with. This gives 0.

0 45 after 45. The search will be performed in (4 of 2).

.

[0089] That is, as described above in Steps 2 to 4 as step 045, after transmitting coA D and sleeping in response to this, N (9.) is further added to 0 in step S5, and 0 is set to 45. Et al. To increase. If this value is larger than nd, the condition in step S6 is not satisfied, A is added to in step S8 through step S7 (that is, 5), and the process returns to step S2 again. 0090 and furthermore, coA D transmitted in step to step S6

The answer is dormant and 0 is 0N (75. Et al. 0N (25.

CC 2… C 7) at 0 (of 4 c), where 0 is 75 . Five . …

75. Step S6, which is larger than nd, is shifted to step S7. If the value is 5 at this point, the condition of step S7 is satisfied, and the process is completed.

[0091] In the above, the antenna C constitutes the above antenna element.

[0092] Further, the directivity 2 of the high frequency 2 and the control 4 constitute a directivity control means for controlling the directivity by a plurality of antenna elements at least in accordance with the separation of the information communication. Directional means provided by a plurality of antenna elements so that the directivity is strengthened in only one direction, and the directions are sequentially changed. In addition, the order of step 8 of control 4-5 constitutes an antenna stage for increasing or decreasing the number of antenna elements used by a plurality of antenna elements at least in accordance with the separation of information communication.

[0093] In this embodiment configured as described above, when the distance from the antenna is relatively large (for example, in the case of 4-2), the directivity is reduced by reducing the antenna. Even if the orientation is widened and the orientation 0 is switched at a large interval, the probability that a large number of tags are required at each time (2) is small, and the information can be successfully obtained by sending unconditional tag commands, so efficient Information can be obtained. In addition, when the communication distance is relatively large (for example, in the case of C to C 7) in 4c), the directivity is increased by increasing the number of antennas, and the directivity 0 is sequentially switched at small intervals. (Because the communication range is limited with CC2C3C4C5C6C7, the probability of successful information acquisition by sending unconditional tag commands is high, and efficient information acquisition is possible. .

[0094] As described above, the optimum antenna directivity is realized by using the directivity between the case where the communication distance is short and the case where the communication distance is long, so that the antenna directivity is the same when the communication distance is short and long. Even when the wireless tags o are dispersed over a wide area (when the number of wireless tags is not very large), the wireless tag information can be efficiently and quickly obtained. In general, in order to extend the distance from the wireless tag, the direction of the antenna can be increased (). However, if the direction of the short-range antenna at a short distance is increased, then Since the receiving sensitivity and the receiving sensitivity of the device become too large, it is difficult to efficiently output the wireless tag. In the embodiment, the above-mentioned harm is avoided by widening the directivity at short distances while realizing directivity for long-distance communication, and realizing optimum antenna directivity according to the distance You can do it.

[0096] Further, in this embodiment, the number of antennas to be used in a short distance is relatively reduced. As a result, the beam width of the radiated radio wave is widened (4 (a) 4 (b)), and there is also a result that the following of the wireless tag can be improved. Conversely, since the number of antennas to be used is relatively large at a long distance, the beam width is narrowed (4c)), and there is an effect that a strong wave can reach far.

[0097] The second state of the light will be described with reference to Figs. In this embodiment, a search by the I-I control is performed, and in a case where a response is made at one time, in many cases, the area is further subdivided and the search power is simultaneously applied to the search. The same symbols are attached to the parts that are the same as those in the above, and the explanation is given.

[0098] Fig. 7 conceptually shows the directional operation of the antenna 2 according to the embodiment 2 having the same configuration as the question, and is a diagram corresponding to 4 in the above embodiment.

[0099] First, as in 6 above, according to item 2 of Question 2 above, the directivity 2 of the high frequency 2 can be switched between the antenna, the directivity, the sharpness, and the direction. In addition, the directivity of the antenna is assumed to be sex (widest), and the transmission power is minimized, and the search for a relatively longer distance from the antenna is performed (6 (a) 0100 And send at the same time Increase the force to change the cable, especially in the case of changing the directionality to several times 2) and divide the cable into two 2 2 (6b)

0101 Move to 7 and use the same method to further narrow down the distance, G, and so on in order to further narrow the direction and further increase the transmission power to search. In this case, as described above, the number of times of switching the directivity direction is sequentially set,

Finally, switch to 3 to 23 for G, switch to G for 4 GG, switch to G2G3G4, and switch to 5 for 2 345 to change the line.

Reference numeral 0128 denotes a feature that is the most significant feature of the present embodiment, ie, the search operation based on the above-described division.

[0103] In this example, as an example, the above-described search operation at a distance from the antenna to a relatively large distance is shown. That is, if many tags are detected at once by the search for the tag described in 6 (a) (or it is estimated that there are many tags at once) (8 (a)), the directivity Then, the direction of the directivity is sequentially changed so that the number is further divided into d to d7 in the example 7), and the search for d to d7 is performed sequentially.

8 b)). Here, for example, when the part of D () is specified in the Png number, which is a command, and the response from the corresponding wireless tag is temporally separated, a number of occurrences occur and the response signal is issued. When it often fails to obtain, it can be estimated that many tags exist in the communication area.

Numeral 11049 is a cha that represents the control procedure of the embodiment 2-4 in order to execute the directivity () in the above-mentioned antennas.

This is started when there is an appropriate force to start from the operating section at 0159, for example.

0 06 First, in step, set the antenna's head to m5 and the above-mentioned division to 4 to not perform. In the example of the directionality of the antenna of the book, in the direction of ・), one direction is strengthened and the direction is changed (either or beaming). , Questions

.

Looking at it, one direction is 9 and the front is.

9 in the other direction. And the other direction is the major direction. ) Their large nd g. Set to.

0107 Then, the process proceeds to step S 2, where the transmission power is (W) P P (for example, P P 2 P 3 P 4 P 5.

Shin power), directivity (plus minus) ().

Set to 9) and set to 0 as above.

Note that the values of the directivity, directivity, and directivity angle large interval (after) are, together with d6 to be described later, in the form of te shown in FIG.

It is fixed (or rewritable) within 4.

. [0109] Next, the process moves to step S3, and returns to the above-mentioned "0" (initial 1).

Accordingly, the phase related to the antenna is determined so that n (n) D = 90, and the corresponding phase signal and (control of the power of the antenna) are transmitted. After outputting to 222C), it outputs coAD signal, which is an unconditional tag command for the wireless tag, and receives the answer (if any). Note that, since the steps are the same as those in step 5 in the above-mentioned state at the time of signal generation, description will be made. The detailed procedure at the time of this process is common to all the commands in the above-mentioned state. If there is a wireless tag that has responded to the coAD signal, the reply (wireless tag including ply and information) transmitted from the tag o is received from the antenna and received and controlled by the receivers 22 to 22. After that, it is taken in by 3 through the 23 frequency unit 23.

0110 Then, in step S4, the wireless tag responded according to the above-described process. Determines where (the tag was known). If at least one of the RFID tags has been replied (if a response signal to the bokeh is received), the determination is satisfied and the routine goes to step S5, where the tag information of the tag o of those tags is successfully obtained. (In other words, the number of reply tags is, and the information could be obtained only by simultaneous communication by the unconditional tag command).

If the tag information is acquired normally, the condition of step S 5 is satisfied and the step S 5

The process proceeds to step 6, and a sp () command is issued for the tag that has been completed by receiving the information (the reception of the tag information has been completed). . The p-number is output, and the process returns to step S3 to repeat the same order.

[0112] If the wireless tag information has not been normally acquired in step S5, the condition is not satisfied, and the routine goes to step S7.

[0113] In step S7, the Png (Png D) signal, which is a command for the wireless tag in the above-mentioned 0 cases, is output, and the signals sequentially returned are received. Specifically, the part of D () is specified in the Png number, and the response from the corresponding wireless tag is temporally separated and extracted.

[0114] The process proceeds to step S8, and if the number of the wireless tags detected temporally separated and detected as described above in step S7 is very large (in other words, it will be described later) Each time it is difficult to obtain unless it is divided into sub-areas and searched again, 8 (a), which is a collection of many wireless tags, is determined. This can be determined from () of the detection line. If there is no LA, if there are few, the wireless tag is O (do not gather), if there is no LA, there are many (collect) wireless tags. If they have not been collected so far (in the case where a certain number of tags are detected in step S7 but they are not enough to search in a small area), this condition is not satisfied, and the process proceeds to step Sg .

[0115] In step Sg, as in step S4 in step 5, Png (Png D), which is the command for the wireless tag in step 0 above, By receiving the response and outputting the co-AD signal, all the tags that responded are recognized by the process of step S7 (along with the matrix of the tag information, A sp (command eep signal) is output to the tag for which reception has been completed.

In detail, as described above, the radio tags which are temporally separated and detected by the Png number are further obtained individually by using the coD number, and when the acquisition is completed, the step is performed. Sleep (do not answer). By repeating the above procedure while changing the designation D, the tag is completely detected individually for all tags for which a response was detected in step S7. When this step Sg ends, the process moves to step S25 (described later).

[0117] On the other hand, in step S8, if the number of wireless tags detected in step S7 is extremely large, the condition in step S8 is satisfied and the process proceeds to step S8. In step S2, the antenna at this point does not perform the above-described division, but determines from o (4).

If 0118 is above 4, the condition is not satisfied, and the routine goes to the step S g, and thereafter, the same order as above is performed. This is because the width of the body is relatively large due to directivity, as shown in an example in G to G 4 and area 5 of 7, so the division is not significant (the directivity was originally narrow, It doesn't make sense to go any further. If is below 3, the condition is satisfied, and the routine goes to Step S2.

[0119] In step S2, the directivity by the subdivision area described above is used.

) Is set to the directivity (corresponding to) d centering around the antenna of the antenna. Also, using the value of 0 at this point, subtracting the directivity range from the directivity of 0, and setting the value of d to which d and d are added, and setting the value of d in the same manner, The large end of 0 is set to end d, which is the directivity 0 and the directivity d is subtracted, and the directivity d is subtracted.

0120 The value of the directivity d according to the above domain is shown below, together with 6 above, along with the large directivity angle interval 0 (after), and 9 below. For example, it is fixed (or rewritable) in the form of te, for example, in R of 4.

[0121] Then, the flow shifts to step S22, and in the same manner as in step Sg described above,

By outputting the Png (Png D) signal, which is a command for the wireless tag, and the coD signal, which is a conditional command, and receiving the response, a response is made according to the process of step S7. Recognize all tags (outputs the eep signal, which is an instruction, for tags that have been completed (tag information reception has been completed) along with a matrix of tag information).

[0122] Then, the process proceeds to step S23.

Add 1 26). Then, the process proceeds to step 4, where it is determined whether or not is larger than 0 end.

From 6 end of 0123, the condition of Step 4 is not satisfied, and the process returns to Step S22, where the directivity is 0.

The same procedure is repeated until the direction 0 becomes larger than end. Thus, for example, in the case of, d d 2 d 3 d 4 d 5 d 6 d shown in 8 b.

As shown in Fig. 7, the search was performed while switching the orientation 0 by shifting the orientation 26 sequentially. Then, the search in the region d7 ends, and in step S23.

When (26) is added, the value becomes larger than 0 end in step S24, the condition of step 4 is not satisfied, and the process proceeds to step S25.

According to the above-described steps S3 to S4, as necessary, in (large) or 2 to 3 shown in 6 (a), 6b) and 7

While searching for subdivisions (for example, d to d7), the search for all tags existing in that area and the (for wireless tag information) are completed.

[0125] Then, the process proceeds to step 25, where the point corresponding to the above-mentioned 0 for the orientation corresponding to the above (large).

If not, add 0.

[0126] Then, the flow shifts to step S26, where 0 is the value of nd (.

9) Bigger throat Is determined. At this point, it is set to 0 by adding N (.) To the original (01.).

Since it is larger than nd, the condition of step S26 is satisfied, and the routine goes to step S27.

.

In step S27, it is determined whether max (5) has been reached. As described above, if, this condition is not satisfied, and the routine goes to Step S28. In step S28, the following is obtained. This gives 45. 0 g. Four .

5 (9 under 9) and P P (P2P). Then, returning to step S2, the same order is repeated.

.

[0128] That is, the orientation 0 45. As described above in steps S3 to S4, the tag that has transmitted the coAD signal and obtained the wireless tag information is put to sleep, the area is subdivided, and the directivity is increased within the divided area (d5, 3). ) After searching using the Png (Png D), co D and eep to obtain radio tag information and sleeping the tag,

Add (9.) to T25 and add 45. 45. To increase.

.

The value of 0 is larger than nd, and the condition of step S26 is not satisfied, and the process returns to step S3, and the pointing is 04.

Repeat the same search with 5. This gives 0 4.

After 5 is 0 4.

The search is performed by 5 (6b) 7-2).

.

[0129] That is, 0.

In step S3 to step 4 above, coAD further obtains the wireless tag information using the Png (PngD), coD, and eep and sleeps the tag, and then proceeds to step S25. (9.) and add 0 to 45. Et al. To increase. If the value is larger than the 6end of 0, the condition of step S26 is not satisfied, and the process proceeds through step S27.

In S28, is set to (that is, 3), and the process returns to step S2 again. In the same manner, the same order is repeated until the value becomes 5 while increasing the value of. However, as described above, if the value is 4, Step S2 to Step 4 are not executed because the value of Step S2 is not satisfied at least, and the operation is not performed by the subdivision area (G to G4 to 5 are subdivided). )

The condition of step S27 is satisfied, and the process of step 9 is completed. [0132] In the above, the directivity 2 of the high frequency 2 in the question 2 and the control 4 are the directivity control means for controlling the directivity by a plurality of antenna elements in accordance with at least the distance of the broadcast communication described above. Is composed.

[0133] In addition, the PP setting is performed according to the directivity in Step 9 performed by the control 4 shown in 9. Step S2 is a power control that increases or decreases the communication power at least in accordance with the separation of information communication. Configure means. Further, steps S2 to S4 of this step are performed by dividing the area into several parts according to the number of wireless tags present or expected to exist in the communication determined by the communication power and the directivity. Configure the division to be set.

[0134] In the embodiment, as in the above-described embodiment, the optimal antenna directivity is realized by using the directivity for short and long communication distances, and the radio tags o are dispersed over a wide area. Even if the wireless tag information can be obtained efficiently in a short time. In particular, since the directivity narrows as n increases, the probability of successfully obtaining information increases even if only the co-AD (condition tag) is transmitted first, and as a result, it is possible to efficiently perform all-wireless communication in a short time. Tags can be detected. Further, at this time, by increasing P to, it becomes easier to detect a tag at a longer distance, and since the tag is in the O-spread mode only at a shorter distance, the occurrence of unnecessary response signals is prevented. 0135 In addition, in this embodiment, the communication area is divided into small areas (d to d7, etc.) according to the number of wireless tags in communication determined by the P directivity of communication. And every wireless tag o information. By doing so, it is possible to receive more efficient and efficient RFID tag information. That is, in general, if the wireless tags are to be output at a time over a wide area, there are many tags (especially wireless tags).

If the D portion of the data matches with a large number of bits, the number becomes enormous and the processing time is enormous. In the embodiment, as described above, the detection area is further divided into small d to d 7 etc. in the large with 6 As a result of the detection, the above-mentioned number is drastically reduced, so that detection can be performed in a short time. [0136] It is to be noted that the present invention is not limited to the above-described embodiment, but may be in any form without departing from the spirit and the idea. Below, such modified examples will be described in order.

0137 () Other actions in directional control

In this state, transmission and reception are performed, and the directivity combined by the antennas is strengthened in only one direction, the direction is sequentially changed, and a predetermined calculation is performed according to the degree and phase of the antenna in each direction. The processing was performed to determine the position of the radio tag, so-called “I / I antenna” was performed, but the present invention is not limited to this. That is, the directivity I / O may be set to the transmission only or the reception only. In the case of the transmission of the signal only, the transmission is performed with the gain of the input amplifier 22 2 2 2 and the gain of the input amplifier 2 6 2 6 2 6 2 6 as the antenna. You can change the transmission to 〒. The same applies to the case where only the message is received.

[0138] Also, the present invention is not limited to the ear control, but may be other directivity control. In other words, the control 4 directivity 2 allows the directivity synthesized by the antennas to be optimized so that the reception sensitivity to the wireless tag o is optimized, and a predetermined arithmetic processing is performed according to the antenna frequency and the antenna frequency. You can also use this method.

[0139] (a) to (c) show, as an example of such a case, a case where the adaptation control is used only for reception. (a) shows a case where there are two tags 2 in a plurality of examples within a frame of the search performed in the above-mentioned state. (b) and (c) show the directivity when receiving adaptation is performed in this case, and (b) shows the receiving directivity so that the optimal directivity can be obtained for the tag on the side. (C shows the case where the reception directivity was changed so that the optimal directivity was obtained for tag 2 on the side. I do.

0140 In addition, the adaptation control may be used for reception, and the transmission may be done or beamed for transmission. Alternatively, it is possible to operate as an ear antenna or a beam-on antenna that attaches the same method to the transmitting and receiving method only at the time of long-distance communication, and improve the quality with long-distance tags. Also, it may be operated as an antenna for reception or reception only at medium distance f), or as a bi-o-guatena.

[0141] A chart showing a control procedure related to the reception adaptation described above after the control procedure performed by control 4.

In step S142, first, in step S3, the phases of the phase shifts 27 to 27 and the gains of the gain amplifiers 28 to 28 are set to predetermined values.

[0143] Then, in step S32, a co signal designating the tag o of the target wireless tag is output from the transmission packets 2 and 2 via the antenna 1 and the reply signal transmitted from the corresponding wireless tag o is output from the antenna 2 to Received by the receiving units 22 to 22, and fetched through the 23 frequency unit 23.

[0144] In this case, instead of maintaining the directivity by the antenna 1 in a single direction and reducing the directivity as in the case of the above-mentioned Iii, the reception sensitivity is optimized by the directivity by the antenna 1. . For this purpose, the control 4 performs a predetermined attachment for each of the antennas in the number of the receivers 22 to 22 relating to the antennas and repeats the transmission / transmission while varying the attachment. It is. Therefore, after the above-described step S33 is completed, in step S34, the weighting of the antennas is determined according to the value of the XS RSQ from the transmitter 22 224, and the corresponding phase is determined in step S35. And (gain) are set, and the corresponding phase signal is output to receivers 22 to 22.

At this time, while the value is stored in an appropriate stage such as in the control 4, the stored value is compared with the value stored up to that time. When the condition of 36 is not satisfied and the process returns to step 32 and the same calculation is repeated, and if the ratio is considered to be equal to or less than the predetermined value by then, it is determined that the calculation has converged. Thus, in this case, the directivity generated by the antennas is searched for so that the degree becomes the maximum value, that is, the optimum degree. If a signal is detected, the directivity is further optimized so that this signal becomes smaller. If the calculated value is substantially constant and the calculation converges, the condition of step S36 is satisfied. However, if not, the determination is not satisfied, and the process returns to step S32 and the same order is repeated.

[0146] Step S32, step S33, step 4, step S35, and step S36 are repeated. When the directivity at which the signal sensitivity is optimum is found for each of the antennas, the calculation is completed, and the condition of step S36 is satisfied. Move on to At this time, there may be a difference between the direction of the tag and the direction of the antenna, such as when the wireless tag is in the same direction. In addition, the tropism may show a maximum in multiple directions. Therefore, the estimated value or the estimated value of the tag is a probability value. [0147] In step 37, the direction in which the tag is located is estimated based on the result, and in step S38, the location in which the wireless tag is located is estimated based on the degree of the bundle.

As described above, the directivity combined by the antennas

Adaptation is performed so that the reception sensitivity for the radio tag becomes optimum, and it is possible to detect the target wireless tag with high sensitivity and at the same time to estimate its location and location.

[0149] As a partial deformation of the above two states, as shown in (a),

If there are many wireless tags in (large), instead of subdividing the area in step S2, transmitting the Png signal in step S22, and switching the directivity in small steps in step S23, the signals from those wireless tags are replaced. It is also possible to detect the direction of the response by adapting the antenna and to direct the direction of the antenna only in that direction (b).

0150 As shown in 3, for example, when two tags are in the same direction, Since it cannot be distinguished by the directivity even by the reception adaptation processing, a normal next detection method (a method of performing the next detection by repeating the Png signal, the coD signal, and the eep signal in step S4 in step 5) is used.

[0151] Further, the present invention is not limited to the use of the antenna C having the transmission / reception function as an antenna, and may be replaced with an antenna dedicated to transmission and an antenna dedicated to reception.

0152 (2)

It is also conceivable to select the type of the signal No. 3 based on the combination of the directionality and the power value of the antenna. In other words, according to the directivity control in the control of the directivity and the control of the transmission power, the kind of command (with the condition of coAD, Png and coD) as access information is controlled. Anyway. The following types are conceivable.

0153 () () With directivity and power in Germany

(a) Transmission power is increased by increasing transmission power

In this case, a large number of tags and information can be obtained by an order within a large area determined by wide directivity and a large communication power.

[0154] (b) Transmitting unconditional commands with low transmission power and wide directivity

In this case, the probability of succeeding in receiving information by an unconditional command without using a limited number of tag commands increases within the range of 2 determined by the wide directivity and small communication power.

0155 (c) Send command with low directivity and directivity

In this case, in a limited area of 2, which is determined by the directivity and small communication power, it is possible to obtain raw and realistic information by dense radio tag instructions.

[0156] (d) Generate unconditional instructions with large transmission power and directivity

In this case, information can be reliably transmitted by a limited number of tag information instructions within a narrow range determined by directional communication power. Wear.

0157 ()

(a) Transmission power is increased by increasing transmission power

Send command with low directivity

Send unconditional command with high directivity

That is, first, the communication power is increased to increase the directivity, a command is generated, and the command is transmitted to the wireless tags.If the number of responding wireless tags is large (equivalent to the number of wireless tags), the communication power is reduced. Information is generated by subdividing into small communication areas with small directivity and generating instructions. Then, when the reception of information is completed using the tag of question 2, the transmission power is generated with a high directivity to generate an information command, and the information is reliably transmitted to the tags in the range from the remaining two, so that the surrounding information can be obtained. Tag efficiency can be used to report wireless tag information.

[0158] (b) Increase the transmission power, spread the directivity, and send the command.

Transmitting unconditional commands with low transmission power and wide directivity

Send unconditional command with high directivity

That is, first, the communication power is increased to increase the directivity, a command is generated, and the command is transmitted to the wireless tags.If the number of responding wireless tags is small (corresponding to several wireless tags), the communication power is reduced. Generates information commands with a small directivity and attempts information in a limited communication area without first searching. Then, when the reception of information using the tag of question 2 is completed, an information command is generated with a large directivity of the transmission power, and the information is efficiently transmitted to the tags in the range from the remaining two tags. The efficiency of the tag can be used for wireless tag information.

0159 (C) However, when the directivity is widened at a short distance in the above case, if an unconditional command is transmitted from the beginning, the rate of occurrence of collisions is high. Then, at a stage where the directionality is narrow to some extent, an unconditional command may be transmitted from the beginning.

[0160] In the above, the signal 3 constitutes an access stage for generating an access report for accessing the tag report of the wireless tag C, and the communication section 22 of the high frequency 2 generates the access report in the access stage. The access information is transmitted to the wireless tag device by touch through multiple antennas, and the access is

A control stage, wherein the control 4 controls the directivity by the directivity control means and the control of the communication power by the power control means, and at least in accordance with at least the directivity control, the type of access information generated by the access stage. Configure access means to control

As described in the above section, various issues, such as unconditional commands, conditional commands, and commands, can be used according to the directivity of the antenna or the power, and the directivity is narrow and wide. Thus, it is possible to realize the most suitable information for each. As a result, there is an effect that wireless tag information can be more efficiently and timely transmitted.

[0162] In addition, within a range not departing from that, the present invention shall be carried out with further modifications.

[0163] Signals such as coAD, coD, Ease, Ve, Pogam, Png, and eep used in the above and the command shall conform to the specifications set by PCoba. PC oba is a co-founder of the International Association, which is an organization that distributes goods, and the FOED Code Coc (CC), which is a US-based organization. It should be noted that a number conforming to other standards may perform the same function.

Claims

Sought

Information communication by touching C (5) of the elephant tag (o)

Directivity control means (42) for controlling the directivity of the number of antennas (～) at least in accordance with the separation of the broadcast and communication;

(2) of the wireless tag system (S) characterized by having

In the tag stem on page 2,

The directivity control means (42) increases the directivity by the number of antennas (～) when the separation is short, and increases the directivity by the number of antennas (～) when the separation is long. (2) of the wireless tag system (S), which is characterized by

In the tag system having a displacement of 3 or 2, the directivity control means (42) holds the directivity of the number of antennas (～) so that it is strengthened in only one direction, and (2) of the wireless tag system (S), comprising

4 In the tag stem in 3

The means (2) increases the gap between the directivity directions when the separation is short, and decreases the gap between the directivity directions when the separation is long. Wireless tag system (S) (2)

In the 5 or 2 tag system,

The directivity control means (2) is configured to optimize the directivity of the number of antennas (～) so that the reception sensitivity to the tag (o) is optimal. 2)

65 In the tag system of the displacement of 5, the directivity control means (42) determines the number of antenna elements used by the number of antennas (-) at least according to the distance of the broadcast. Increase or decrease (2) of a wireless tag system () characterized by comprising an antenna (8)

7 In the tag stem described in 6

(2) The wireless tag system (S), wherein the antenna (58) increases the number of antenna elements used by the number of antennas (～) when the distance between broadcast and communication is long.

8 or 2 of the tagless stem

The directional control means (42) has the number of wireless tags (S8 to S4) for detecting the number of the tags (o) existing in the communication area, and determines the number of tags (S8 to S24). (2) The wireless tag system (2), wherein the directivity of the antennas (の) is controlled in accordance with the number of detected wireless tags (2).

98 A wireless tag system (S) characterized in that it has a power control means (S2) for increasing or decreasing the communication power in accordance with the distance of the broadcast at least in the tag system of (8). (2) In the tag stem described in 109,

According to the number of the tags (o) existing or expected to be present in the communication area determined by the communication power and the directivity, the area is divided into several pieces to set the area (S2 to S24). (2) of a wireless tag system () characterized by having the tag (o) and the corresponding signal for each

1 9 or in the tag stem above

An access (3) for generating an access report for accessing the tag report of C (5) of the tag (o);

The access information generated in the access (3) is transmitted to the tag (o) by touch through the number of antennas (～), and the access is performed.

(2 2 and

The directional control and the control means (42) by the directional control means (42) The access means (4) for controlling the kind of access information generated first in the directivity by the access (3) in accordance with at least the control of the directivity according to 2). (2) of a wireless tag system characterized by having

In the tag stem on page 2,

The access stage (4) is a condition command for the access (3) to unconditionally acquire the tag information of c (5) in response to the direction control by the direction control means (42). With the condition for acquiring the tag information of c (5) under a predetermined condition

(2) a wireless tag system () characterized in that the tag information of c (5) is searched under an uncertain condition to generate a delay of the command.

3 In the tag stem in 2

The directivity control means (4), the control means (2), and the access means (4) spread the transmission power to generate the conditional command, and generate In the tag system described in (2) 42 of the wireless tag system (), which is controlled in cooperation with each other so as to transmit,

The directional control means (4), the control means (2), and the access means (4) first generate the condition command after increasing the directional power of the transmission power, and generate the tag (o (2) of the wireless tag system () characterized in that control is performed in cooperation with each other so that

5 In the tag stem in 2

When it is expected that a large number of the tags (o) are present, the directional control means (4), the control means (2), and the access means (4) reduce the transmission power to the (2) a wireless tag system () characterized in that the wireless tag system () generates a command and transmits the tag ( 6 In the tag stem on page 2,

The directivity control means (4), the control means (2), and the access means (4) first generate the condition command after making the transmission power directional, and then generate the tag (o). (2) wireless tag system () characterized in that control is performed in cooperation with each other so that

7 In the tag stem in 3

The directional control means (4), the control means (2), and the access means (4) are:

After generating the command by spreading the transmission power and transmitting the command to the tag (o),

When it is expected that a large number of the tags (o) are present, the transmission power is generated in a directional manner, the command is generated, and transmitted to the tag ().

Further, the wireless power tag system is characterized in that the control is performed in cooperation with each other such that the condition is first generated and the condition is first generated and transmitted to the tag (o). ( )of 2 )

8 In the tag stem described in 3

When it is expected that the tag (o) is present in a small number, the transmission power is broadened to generate the condition command, and is transmitted to the tag (o).

Further, the transmission power is made highly directional and the above condition is satisfied.

The wireless tag system () is characterized in that a command is generated and transmitted to the tag (o so as to be controlled in cooperation with each other.